On Sun, 28 Jan 2007, Don Lee wrote:
There is a large and growing number of mailservers "out there" that
try to resolve the HELO name, and some do rDNS on the IP and
ensure that it matches the HELO.
There is no need to do the rDNS if the HELO name resolves to the IP. It
is a (minor) waste of bandwidth and is unfair to those of us with
broken ISP monopolies. I suppose I am a broken record on the topic.
All PTR records provide is a name - that you have to verify by checking
that it resolves to the IP. Well, guess what, a HELO name is a ... name ...
that you can verify by checking that it resolves to the IP - clearly
establishing that the domain owner designated that IP. So why
did you bother fetching the PTR records again?
--
Stuart D. Gathman <stuart(_at_)bmsi(_dot_)com>
Business Management Systems Inc. Phone: 703 591-0911 Fax: 703 591-6154
"Confutatis maledictis, flammis acribus addictis" - background song for
a Microsoft sponsored "Where do you want to go from here?" commercial.
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